How do vending machines know which coins and notes you put in?
Answers:
One thing I have seen is that bill scanners have fuzzy logic circuits. They determine authenticity on a pass fail basis. They also have a "courtesy" setting that will pass a bill as genuine if the machine is only reasonably certain. They pass a certain number of bills the machine is not absolutely certain about. Otherwise the machine would loose customers in the way a "cold" slot machine does. Check other answer for coin weight etc. That was a good answer, I think.
they go through a coin mech which scans them, it can tell if there weight , size and what there made out of, very hard to fake, sorry
cos there is a little person inside who seperates the coins
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